(vac´ yew ole) [Fr.: small vacuum] • A liquid-filled cavity in a cell, enclosed within a single membrane. Vacuoles play a wide variety of roles in cellular metabolism, some being digestive chambers, some storage chambers, some waste bins, and so forth.
(L. vacuus: empty) n. One of a number of different types of membrane-bound organelles in cells. Plant cells are typically characterized by having a large vacuole that may occupy over 90% of the cell's volume and contributes to the cell's turgor. The vacuole is also a site for the storage of various metabolites or pigments (as in beetroot cells). Vacuoles may be present in animal cells where they have a number of storage or metabolic functions including the 'food vacuoles' of phagocytes.
A vacuole is a large, membrane-bound space within a plant cell that is filled with fluid. Most plant cells have a single vacuole that takes up much of the cell. It helps maintain the shape of the cell.
Vacuoles are membrane-bounded compartments within some eukaryotic cells that can serve a variety of secretory, excretory, and storage functions. Vacuoles and their contents are considered to be distinct from the cytoplasm, and are classified as ergastic according to some authors. Esau, K. (1965).